Global positioning system self calibration attitude determination

摘要

An improved GPS Attitude Receiver for spacecraft uses concurrent line-bias estimates derived from GPS signals for attitude determination. Attitude determination is obtained from GPS measurements by an interactive solution of the known "Attitude Master Equation", using RF differential phase measurements and calibrated parameters of baseline vectors and line-biases. A "weighted fit error" W, is derived from the sum squared of discrepancies between predicted and actual measurements, weighted by measurement variances. By minimizing W, the line-bias estimations obtained give more current data including thermal effects and eliminate separate ground calibration tests.